A Pennsylvania teenager who had more than 50 pro-ISIS Twitter accounts and threatened to behead US President Barack Obama inside the White House has been arrested by the FBI.

Jalil Ibn Ameer Aziz, 19, from Harrisburg, Pennsylvania was arrested after federal anti-terror agents raided the $122,000 three-bedroom home he shares with his parents after tracking down the IP address used on his allegedly pro-terror Twitter accounts.

According to documents lodged at the United States District Court for the Middle District of Pennsylvania, Aziz 'espouses violent jihadist beliefs and is a fervent supporter of a foreign terrorist organisation known as the Islamic State of Iraq and Levant'.

Aziz is accused of conspiring with others to travel to Syria to fight with ISIS, while trying to radicalise and recruit others to his cause.

During a raid at his home on November 27, officers recovered 'a tactical-style backpack' in his closet. The bag contained 'five M4-style high-capacity magazines loaded with 5.56 ammunition, a modified kitchen knife with the handle removed'.

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He also had a balaclava of a 'similar style worn by ISIS members to hide their identities'.

According to the affidavit Aziz pledged allegiance online to Abu Bakr al-Baghdadi, leader of ISIS.

On January 29, using his @Colonel_Shami alias he allegedly tweeted: '#IS Know O Obama, that we are coming to America and know that we will sever your head in the White House'.

Pennsylvania have very light gun laws its very easy to arm yourself

Several of the accounts, linked to an IP address based at Aziz's home, threatened acts of violence against the United States.

On March 21, 2015 he boasted using the alias @Baqiyaah201S: 'Pennsylvania have very light gun laws its very easy to arm yourself'.

He also allegedly asked online about buying a Yazidi woman as a sex slave.

According to court documents, Aziz enquired as to the cost of Yazidi women and explained he wanted one aged 17.

Aziz is accused of boasting online about Pennsylvania's lax firearm laws as it is 'very easy to arm yourself'

The FBI believes that Aziz was in direct contact with ISIS terrorists in Syria and encouraged acts of violence

Aziz is currently being held in custody and has been charged with two counts of supporting terrorism

It is also alleged that Aziz posted the personal details, including the addresses of 100 US military members online.

The FBI believes that Aziz was in direct contact with ISIS members in the Middle East and passed one suspect, named CC-1 a Turkish phone number which was located close to the Syrian border.

'Law enforcement has confirmed that Aziz shared at least 74 direct messages with the Twitter account of CC-1 and at least 41 direct messages with CC-2 and other ISIL members from May 26, 2015 to May 27, 2015.

Aziz has been charged with two counts of attempting to provide material support to terrorists.

He is due to appear in court next week for a preliminary hearing and his currently being held in custody.

A message left at Aziz's home wasn't immediately returned Thursday. A hand-written sign tacked to the door said: 'No Comment No News! No Tresspassing.'

Court documents showed that Aziz needed 57 Twitter accounts because the social media company would regularly suspend his access because of the extremist nature of his posts.

A spokeswoman for Mayor of Harrisburg Eric Papenfuse said: 'The Mayor has been at the forefront of efforts to promote sensible gun laws, and it is even more alarming that alleged terrorists believe they can easily get guns in our state.

'The arrest of Mr. Aziz and his statements to ISIS sympathizers about the ease of acquiring weapons in Pennsylvania should be a wake-up call to lawmakers that something must be done soon to protect our citizens and make it more difficult for terrorists to get weapons.'

A message tacked to the door of the $122,000 home Aziz shares with his parents said 'No Comment No News!'

Assistant Attorney General John Carlin said: 'We will remain vigilant in our efforts to hold accountable any and all those who seek to provide material support to terrorists, and to disrupt potential attacks in the United States before they happen. 'According to the allegations in the complaint, Jalil Ibn Ameer Aziz conspired to provide and attempted to provide material support to ISIL by propagating their hateful rhetoric on social media and aiding individuals in their pursuit of traveling overseas to join the designated foreign terrorist organization

'A prior physical search of Aziz’s residence also revealed a tactical-style backpack in his closet, which contained high-capacity weapons magazines, ammunition, a knife, and other survival items. The National Security Division’s highest priority is counterterrorism, and we will remain vigilant in our efforts to hold accountable any and all those who seek to provide material support to terrorists, and to disrupt potential attacks in the United States before they happen.'

US Attorney Peter Smith said: 'The charges in this case focus on Aziz’s efforts to assist persons seeking to travel to and fight for the Islamic State. These charges are a testament to the perseverance and dedication of those who stand watch over our nation and a clear message that those who support terrorism – will face justice.'

Special Agent in Charge William Sweeney said: 'The FBI’s Joint Terrorism Task Force (JTTF) will move with speed to detect and disrupt those who are involved in facilitation or operational planning in support of a terrorist organization.

'There is no difference between the two, and we will aggressively pursue every threat in order to protect our communities

'In this instance, Aziz operated quietly on behalf of the Islamic State and facilitated others looking to do the same.